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Copy pathelf_loader_reader.c
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163 lines (149 loc) · 5.08 KB
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/*
# _____ ___ ____ ___ ____
# ____| | ____| | | |____|
# | ___| |____ ___| ____| | \ PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
#include "elf_loader_common.h"
#include <string.h>
void elf_loader_reader_read_elf_file(elf_loader_reader_info_t *info)
{
void *ptr;
int ret;
ptrdiff_t cur_alloc_block_size;
ret = -10;
cur_alloc_block_size = 0;
ptr = info->m_alloc_callback(
info->m_userdata,
NULL,
0,
sizeof(elf_loader_elf32_ehdr_t) + (sizeof(elf_loader_elf32_phdr_t) * ELF_LOADER_MAX_PROGRAM_HEADERS));
if ( ptr )
{
elf_loader_reader_segment_info_t elf_segment_info[1];
ret = -11;
cur_alloc_block_size =
sizeof(elf_loader_elf32_phdr_t) + (sizeof(elf_loader_elf32_phdr_t) * ELF_LOADER_MAX_PROGRAM_HEADERS);
elf_segment_info[0].m_segment_addr = ptr;
elf_segment_info[0].m_segment_offset = 0;
elf_segment_info[0].m_segment_size = cur_alloc_block_size;
if ( !info->m_read_callback(
info->m_userdata,
ELF_LOADER_READER_STAGE_ELF_HEADER,
&elf_segment_info[0],
sizeof(elf_segment_info) / sizeof(elf_segment_info[0])) )
ptr = info->m_alloc_callback(info->m_userdata, ptr, cur_alloc_block_size, 0);
}
if ( ptr )
{
int ret;
ret = elf_loader_is_elf_ehdr_valid(ptr);
if ( ret )
ptr = info->m_alloc_callback(info->m_userdata, ptr, cur_alloc_block_size, 0);
}
if ( ptr )
{
elf_loader_elf32_ehdr_t *elf_header;
elf_loader_reader_segment_info_t elf_segment_info[1];
u32 phoff;
ret = -12;
elf_header = (void *)ptr;
elf_header->e_shoff = 0;
elf_header->e_shentsize = 0;
elf_header->e_shnum = 0;
elf_header->e_shstrndx = 0;
phoff = elf_header->e_phoff;
elf_header->e_phoff = sizeof(elf_loader_elf32_ehdr_t);
elf_segment_info[0].m_segment_addr = ((u8 *)ptr) + elf_header->e_phoff;
elf_segment_info[0].m_segment_offset = phoff;
elf_segment_info[0].m_segment_size = sizeof(elf_loader_elf32_phdr_t) * elf_header->e_phnum;
if ( !info->m_read_callback(
info->m_userdata,
ELF_LOADER_READER_STAGE_PROGRAM_HEADERS,
&elf_segment_info[0],
sizeof(elf_segment_info) / sizeof(elf_segment_info[0])) )
ptr = info->m_alloc_callback(info->m_userdata, ptr, cur_alloc_block_size, 0);
}
if ( ptr )
{
elf_loader_elf32_ehdr_t *elf_header;
elf_loader_elf32_phdr_t *elf_pheader;
int i;
u32 offs_sum;
ret = -13;
elf_header = (void *)ptr;
elf_pheader = (void *)(((u8 *)ptr) + elf_header->e_phoff);
offs_sum = 0;
// Remove any unused program headers
for ( i = 0; i < elf_header->e_phnum; i += 1 )
{
while ( i < elf_header->e_phnum && (elf_pheader[i].p_type != 1 || elf_pheader[i].p_filesz == 0) )
{
elf_header->e_phnum -= 1;
memmove(&elf_pheader[i], &elf_pheader[i + 1], sizeof(elf_loader_elf32_phdr_t) * (elf_header->e_phnum - i));
}
}
// Sort program headers by address
for ( i = 1; i < elf_header->e_phnum; i += 1 )
{
int j;
elf_loader_elf32_phdr_t phdr_tmp;
phdr_tmp = elf_pheader[i];
for ( j = i - 1; j >= 0 && phdr_tmp.p_vaddr < elf_pheader[j].p_vaddr; j -= 1 )
{
elf_pheader[j + 1] = elf_pheader[j];
}
elf_pheader[j + 1] = phdr_tmp;
}
offs_sum = sizeof(elf_loader_elf32_ehdr_t) + (sizeof(elf_loader_elf32_phdr_t) * elf_header->e_phnum);
for ( i = 0; i < elf_header->e_phnum; i += 1 )
{
offs_sum += elf_pheader[i].p_filesz;
}
ptr = info->m_alloc_callback(info->m_userdata, ptr, cur_alloc_block_size, offs_sum);
cur_alloc_block_size = offs_sum;
}
if ( ptr )
{
elf_loader_elf32_ehdr_t *elf_header;
elf_loader_elf32_phdr_t *elf_pheader;
elf_loader_reader_segment_info_t elf_segment_info[ELF_LOADER_MAX_PROGRAM_HEADERS];
int i;
u32 offs_sum;
ret = -14;
elf_header = (void *)ptr;
elf_pheader = (void *)(((u8 *)ptr) + elf_header->e_phoff);
offs_sum = sizeof(elf_loader_elf32_ehdr_t) + (sizeof(elf_loader_elf32_phdr_t) * elf_header->e_phnum);
for ( i = 0; i < elf_header->e_phnum; i += 1 )
{
elf_segment_info[i].m_segment_addr = ((u8 *)ptr) + offs_sum;
elf_segment_info[i].m_segment_offset = elf_pheader[i].p_offset;
elf_segment_info[i].m_segment_size = elf_pheader[i].p_filesz;
elf_pheader[i].p_offset = offs_sum;
offs_sum += elf_segment_info[i].m_segment_size;
}
// Sort segment info by offset in file
for ( i = 1; i < elf_header->e_phnum; i += 1 )
{
int j;
elf_loader_reader_segment_info_t segment_info_tmp;
segment_info_tmp = elf_segment_info[i];
for ( j = i - 1; j >= 0 && segment_info_tmp.m_segment_offset < elf_segment_info[j].m_segment_offset; j -= 1 )
{
elf_segment_info[j + 1] = elf_segment_info[j];
}
elf_segment_info[j + 1] = segment_info_tmp;
}
if ( !info->m_read_callback(
info->m_userdata, ELF_LOADER_READER_STAGE_SEGMENTS, &elf_segment_info[0], elf_header->e_phnum) )
ptr = info->m_alloc_callback(info->m_userdata, ptr, cur_alloc_block_size, 0);
}
if ( ptr )
{
ret = 0;
}
info->m_result_callback(info->m_userdata, ptr, cur_alloc_block_size, ret);
}